Castro's speech will call for investment in future generations

Lisa Krantz/San Antonio Express-News

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Mayor Julian Castro, right, holds his daughter, Carina, 3, as he greets supporters upon his arrival at the send-off party for his trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012.

Mayor Julian Castro, right, holds his daughter, Carina, 3, as he greets supporters upon his arrival at the send-off party for his trip to the Democratic National Convention at the St. Paul Community Center in San Antonio on Saturday, Sept. 1, 2012.